[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]
No, I see increases in the both channels on the same exposure.
Hmmm! There is the possibility of parallax. As I noted, the bright hit is
To repeat, there are simultaneous increases. Sometimes more than one in
the daily measurements. i.e. I measure a star every time the sky is clear
and it transits the meridian. I have at least 10 and as many as 40 single
nightly measurements in the data base I am studying. Most often there is a
single high point in the V and I channels for one night. But sometimes
more than one night has a high measurement.
While this could be a "bad night", there are not so many of these. A bad
night might make all the measurements for the night high. I would get tens
of thousands of such stars in that case. Besides, some of these are of
order a mag, and that is more than the probable error for the worst data
At 10:07 AM 5/18/03 -0700, Arne Henden wrote:
>George Turner's suggestion of cosmic ray hits is the most
>likely answer. Faser's events are all possible, but with
>low probability. Tom's idea of plane lights won't work (you
>would see the parallax between two cameras). I also assume
>that you see this in only one of the two cameras, right?
>Fraser Farrell wrote:
>>Tom Droege wrote:
>>>Are there many stars that flash? I keep finding stars with one bright
>>TASS Press Release : the Mark IV discovers gravitational lens events.... :-)
>>Three of the four astronomical possibilities that come to mind can all be
>> - Pulsars. Not bright enough (optically), and they would flash many
>> many times during a single Mark IV exposure.
>> - Gamma ray burst's optical counterpart. This might explain those
>> occasional "seen once and never again" stars.
>> - Dwarf novae outbursts typically go on for hours, sometimes days. Lots
>> of these potentially detectable by TASS. But if you're taking many
>> images per night of a dwarf nova, you would see it "bright" on several
>> consecutive images.
>>The fourth possibility is red dwarfs that are Flare Stars. These are
>>detectable as occasional outbursts of light & radio waves that last 10-30
>>minutes. Proxima Centauri, for example, can brighten from its usual mag
>>11 up to mag 9 during a flare. Quite a sight if you're lucky enough to see one!
- From: Tom Droege <firstname.lastname@example.org>
- Re: Flashers
- From: Fraser Farrell <email@example.com>
- Re: Flashers
- From: Arne Henden <firstname.lastname@example.org>